Julian Cheung Chi-lam, better known by his stage name Chilam, is a Hong Kong singer and actor. Cheung is popularly known for his role as Guo Jing in the 1994 TV series adaptation of the Wuxia novel, The Legend of the Condor Heroes, and also as Chi-Kin from the TVB drama Cold Blood Warm Heart (1996).

Guo Jing is the fictional protagonist of the wuxia novel The Legend of the Condor Heroes by Jin Yong. He also appears as a supporting character in the sequel, The Return of the Condor Heroes, and is mentioned by name in The Heaven Sword and Dragon Saber. He is a descendant of Guo Sheng, one of the 108 outlaws from Mount Liang in the classical novel Water Margin. Guo Jing and Yang Kang were both named by Qiu Chuji, who urges them to remember the Jingkang Incident and be loyal towards their native land, the Song Empire. Guo Jing is killed during the Battle of Xiangyang along with the rest of his family except his younger daughter, Guo Xiang.